CN2404676Y

CN2404676Y - Hopper heating apparatus for plastic injection formation machine

Info

Publication number: CN2404676Y
Application number: CN 99252273
Authority: CN
Inventors: 张立民; 李宙按
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-12-28
Filing date: 1999-12-28
Publication date: 2000-11-08
Anticipated expiration: 2009-12-28

Abstract

The utility model relates to a hopper heating apparatus for a plastic injection formation machine. An induction coil which is isolated with a hopper is winded at the outside of the hopper of the existing hopper. A heat-insulating layer is arranged between the hopper and the induction coil. Middle and high frequency power source is leaded into the induction coil, and a metallic hopper is inducted to generate middle and high-frequency short circuit eddy-current to heat the hopper. The utility model has the advantages of high thermal efficiency, precise temperature control and easy modification.

Description

Plastic-injection moulding machine barrel heater

The utility model relates to a kind of heater of plastic-injection moulding machine barrel.

Plastic-injection moulding machine barrel heater of the prior art, be that electric heating coil lock ring with the heating wire coiling is on the plastic-injection moulding machine barrel, the electric heating coil heating power, the conduction heating cylinder, make plastic granule plastifying fusion in the barrel, so that the barrel inner screw is clamp-oned mould molding with the plastics injection of fusion plastification, this electric heating coil heater, barrel obtains heat by electric heating coil contact conduction, heat transfer efficiency depends on both temperature difference and contact conditions, influenced by contact condition by both, the thermal efficiency is generally lower, the temperature of electric heating coil needs to set the high number of operating temperature degree of picking up to hundreds of degree than barrel, can form certain different transfer of heat, after long-time the use, because the clamping under the contact layer surface oxidation and the condition of high temperature was lost efficacy, can cause the electric heating coil temperature to be much higher than the barrel design temperature, when barrel reaches design temperature, after temperature controller cuts off the electric heating coil power supply, barrel temperature still can continue to rise within a certain period of time, there is bigger thermal inertia, when the processing temperature sensitive material, to cause the manufactured goods quality to descend, bring certain difficulty to processing, therefore this barrel electric heating coil heater also need be equipped with cooling blower sometimes, opens blower fan cooling electric heating coil and barrel when barrel reaches operating temperature, cause energy consumption to increase, aggravating working environment in a large number dispels the heat.In order to reform the defective of barrel electric heating coil heater, occur barrel line-frequency induction heater in the prior art, but it has certain requirement to sectional dimension, the volume of sensed element, size is more little, efficient is low more, and because current change quantity is little, number of inductive coil turns is many, and must add iron core increases magnetic loop, cause bulky, heavy, barrel can't take effectively to be incubated measure, and inconvenience is installed, and uses and is subjected to bigger restriction.

The purpose of this utility model provides a kind of heater of plastic-injection moulding machine barrel, and it adopts middle and high frequency electric current to respond on barrel by induction coil and produces the short circuit eddy-current heating, reaches the purpose of heating cylinder.

For reaching above-mentioned purpose, plastic-injection moulding machine barrel heater of the present utility model, comprise middle and high frequency power, induction coil and heat-insulation layer, heat-insulation layer at the original barrel outer wrapping of plastic molding press double as insulating barrier, the outer coiling induction coil of heat-insulation layer connects middle and high frequency power on the induction coil.

The advantage of the utility model plastic-injection moulding machine barrel heater is: 1, thermal efficiency height, barrel is eddy current short circuit heating under the effect of medium-high frequency alternating current, the outer induction coil of barrel does not generate heat, electric energy directly converts heat energy on barrel, the conversion efficiency height because induction coil is to transmit energy to penetrate very strong alternating magnetic field, can adopt the heat-barrier material insulation like this outside the barrel of heat generating member, make heat energy not excessive, thereby improve the thermal efficiency; Barrel insulation layer wraps up simultaneously, and outwards heat radiation is very little, and working environment is improved.2, temperature control is accurate, improves the manufactured goods quality.As long as this heater is cut off the electricity supply, no longer produce the short circuit eddy current on the barrel, stop heating immediately, there is not thermal inertia, so temperature-controlled precision improves greatly.3, easy for installation, need not change plastic molding press barrel structure.Be not subjected to the restriction of barrel sectional dimension size, do not have the close circle induction coil and the heavy iron core of line-frequency induction heater yet, reequip this heater for existing injection molding machine and provide convenience.

Fig. 1 is the structure cutaway view of the utility model plastic-injection moulding machine barrel heater.

The utility model is described in further detail in conjunction with the embodiments with reference to the accompanying drawings.

Shown in Figure 1, screw rod (1) in barrel (2) that the former machine of plastic-injection moulding machine is disposed and the barrel, garden tubular barrel wraps heat-insulation layer (3) outward, the outer coiling induction coil (4) of heat-insulation layer, induction coil is looked barrel feed zone, discharging section, the section of heating the difference of temperature is required to be divided into the coiling of 2-8 section, and every section induction coil inserts respectively on the middle and high frequency power that frequency is the 1000-100000 hertz.

With plastic-injection moulding machine barrel heater plastic extruder barrel heater roughly the same, also within protection domain of the present utility model.

Claims

1, the barrel heater of plastic-injection moulding machine comprises medium-high frequency power supply, induction coil, it is characterized in that the induction coil of outer coiling of barrel and barrel insulation, and the induction coil two ends connect middle and high frequency power.

2, plastic-injection moulding machine barrel heater as claimed in claim 1 is characterized in that: between barrel and the induction coil heat-insulation layer is arranged.

3, plastic-injection moulding machine barrel heater as claimed in claim 1 or 2 is characterized in that induction coil divides the coiling of 2-8 section on barrel, on the power supply that every section connects setpoint frequency respectively.